I managed to bring down my A1C numbers every 6 months. i was at 6.1 and pre-diabetic and went down to 5.6 and no longer pre-diabetic. Pre-diabetes is between 5.7 and 6.4. I was able to accomplish this by diet only. I think the key is to drink only water and eat fruit. Cut out pop/soda, candy, sweets, and dessert. You can eat other things, like meat and pasta. And do not eat nuts of any kind. Nuts are bad for your health.